Coffee making apparatus



R. W. OMAN March 9, 1937.

COFFEE MAKING APPARATUS Original Filed Jan. 9, 1933 INVENTOR: 7P0 Y 140/444,

ATTORNEY.

Patented Mar. 9, 1937 UNITED STATES 2,073,285 COFFEE MAKING APPARATUSRoy W. Oman, Los Angeles, Calif.

Application January 9, 1933, Serial No. 650,777

Renewed August 3, 1936 2 Claims. (01. 53-3) This invention relates tocoffee makers, and

more particularly to a coiiee making apparatus v which willautomatically control the supply of hot water to a coffee filteringchamber forming 5 part or the apparatus.

The general object of the invention is to provide a coffee makingapparatus which will automatically prevent further supply of boilingwater to a coifee filter, forming part of the apparatus,

10 when a predetermined amount of boiling water is supplied to saidfilter, thus preventing further filtering of the coffee and furtherboiling of the coffee liquor.

A particular object of the invention is to pro 15 vide a coffee makingapparatus which will automatically by-pass the supply of hot water to awater supply receptacle, when a predetermined amount .of boiling wateris supplied to a coffee filter forming part of the apparatus.

Another object of the invention is to provide a device of the characterstated which is' simple, and highly efiicient in operation.

Other objects and advantages will appear hereinaiter.

The invention is illustrated in the annexed drawing which forms a partof this specification and in which,

Figure 1 is a vertical longitudinal section of a cofiee making apparatusfor household use 30 embodying my invention.

Figure 2 is a fragmentary vertical longitudinal section on an enlargedscale of the apparatus shown in Figure 1, showing the fioat controlvalve lowered and uncovering the filter tube outlet for by-passing theboiling water into the water supply receptacle when a predeterminedamount of boiling water is supplied to the coffee filter.

Figure 3 is vertical longitudinal section of a coflee making apparatusof the urn type embodying my invention, showing the float valveuncovering the by-pass outlet of the filter tube.

Figure 4 is a fragmentary vertical longitudinal section on. an enlargedscale of the apparatus shown in Figure 3, showing the fioat controlvalve 5 raised and closing the by-pass outlet in the filter tube.

Corresponding parts are designated by the same reference characters inthe figures of the drawing. I

so Referring particularly to the drawing my in-v vention comprisesgenerally a water supply receptacle I, a water boiling chamber -2, acofiee receptacle 3, a check valve 4 controlling the supply oi waterfrom said water receptacle to said 55 heating chamber, a filter 5, and afloat control valve 6 for automatically controlling the supply ofboiling water from said water boiling chamber through a "hot waterfilter supply tube 1 to the dry coffee placed in the filter chamber 8.

In Figures 1 and 2 of the drawing I have illus- 5 trated my inventionembodied in an apparatus of the coffee pot type for household use, thecoflee receptacle 3 being in the-iorm'oi a coffee pot having an opening9, in the top thereof, covered by a lid l0, including a spout H and ahandle I2. 10 Thebottom portion l3 of the receptacle 3 is reduced and anexternal shoulder I4 is formed on the receptacle, above said reducedbottom portion, to rest upon a seat l5, formed on the upper edge of aneck 18, upstanding from the upper edge of the water receptacle l ofbowl formation, with said reduced bottom portion l3 fitting within saidneck It, whereby the coffee receptacle 3 is detachably mounted in thewater supply receptacle I. The coffee receptacle 3 is provided with anopening I! in the bottom wall thereof, and a tubular seat l8 extendsupwardly from said bottom wall around said opening-for supporting thefilter chamber 8 in the upper part of the cofiee receptacle within theopening 3 in the top thereof and for receiving the filter tube 1, whichextends upwardly from the water boiling chamber 2 through said openingI! in the bottom of the coffee'receptacle and through said tubular seatinto the upper part of said filter receptacle. I

The water supply receptacle l is formed with legs 19 to rest upon astove for supporting the receptacle on the stove with the water boilingchamber 2 resting over the stove burner (not 5 shown)' said boilingchamber being mounted in the bottom oi said receptacle and dependingtherefrom.

The water boiling chamber 2 is closed at its upper and inner end by aplug 20 screw seated 40 therein, as indicated at 2|, said plug beingprovided with inlets 22 leading from the water supply receptacle I intothe boiling chamber 2. The plug 20 is formed with 9. depending stud 23extending downwardly in the boiling chamber 2, and the outlet 24 of saidchamber extends through said stud and the plug 20 in communication withthe lower end of the filter tube'l which is screw-seated in said plug.

The check valve 4 is in the form of a fiat collar which is slidablyfitted on the stud 23 to descend and uncover the inlets 22 to admitwater from receptacle i into the boiling chamber 2, and to be raised bythe pressure of the boiling water in said chamber to close said inletsto shut oi! the 15 within the water supply receptacle I.

supply of water from said receptacle into said chamber so that thepressure will force the boiling water from said chamber up through thefilter tube 1 into the filter chamber 8. A nut 25 is 5 screw-seated onthe lower end of the stud 23 for arresting the descent of the checkvalve 4 and adjusting the movement of said valve for its most efficientoperation.

The float valve 6 comprises a float 28, a by-pass 10 outlet 21 in thefilter tube 1 of an area corresponding to the area of the upperdischarge end of said tube, and a stop 28 on said tube for limiting therising movement of the float in position closing said outlet. The floatvalve 6 is located The float 26 is formed with an opening 29 extendingtherethrough to receive the filter tube 1 whereby the float is slidablymounted on said tube. The outlet 21 is preferably triangular shape withone side thereof uppermost and extending cross-wise of the tube 1 sothat when the water level and float descend it will first uncover thelargest area of the outlet, thus enabling the fioat'to. uncover theoutlet for effective operation in by-passing the boiling water in saidtube into the receptacle I above the water level therein.

The operation, uses and advantages of my invention are as follows:

Water of a predetermined amount is placed in 30 the receptacle I to alevel which causes the float 26 to rise and close the by-pass outlet 21in the filter tube 1. (See Figs. 1 and 4.) Dry coffee of a suitableamount is placed in the filter chamber 8. The check valve 4 resting uponthe nut 25 and uncovering the inlets 22, water passes fromthe receptacleI through said inlets into the boiling chamber 2. The apparatus isplaced on a stove with the water boiling chamber 2 over the stoveburner. As the water boils in the chamber 2 its pressure forces thecheck valve 4 up against the plug 28 and closes the inlets 22,preventing the escape of the boiling water from said chamber throughsaid inlets into the receptacle I, and causing the boiling water to beforced up through 5 the filter tube I out through the upper end thereofand into the filter chamber 8, where it filters through the dry cofleein said filter chamber and through the perforations of said chamber intothe coffee receptacle 3. As the boiling water passes out of the boilingchamber 2 up the filter tube I, the reduced pressure in said chamberallows the check valve 4 to descend and uncover the inlets 22, whereuponadditional water passes from the supply receptacle I, through the inlets22, into the' chamber 2, until said chamber is again filled with waterand said inlets again closed by the check valve 4 under pressure of theboiling water in said chamber. Additional boiling water is then forcedup the filter tube 1 and filtered through the dry coifee in the filterchamber 8 and through said chamber into the coffee receptacle 3, and theabove described operations are repeated until coifee of the desiredconsistency and flavor is made in said coffee receptacle, at and thefloat 26 have sunk to a level where said float uncovers the by-passoutlet 21 in the filter tube I, whereupon theboiling water in said tubeis by-passed therefrom through said outlet into the supply receptacle Iabove the level of the water therein, and additional boiling water isthus prevented from passing upthrough saidtube, out of the upper endthereof and through the filter chamber 8 into the coffee receptacle 3and reboiling the coffee liquor in said receptacle. The

which time the water in-the supply receptacle I apparatus may thenremain on the stove indefinitely without further boiling of the coffeeliquor in the receptacle, the only effect being to keep the coffee warm.

When the water level and the float 26 have sunk to a. point where saidfloat uncovers the by pass outlet 21, a certain amount of water, up tothe level indicated 38, is left in the supply receptacle I, whichremains in the receptacle, until additional water is placed therein tomake more coffee, and prevents the heat of the stove burner from burningup said receptacle while the apparatus remains on the stove.

The coffee receptacle 3 may be raised off the water supply receptacle Iand used as a conventional household coffee pot, the filter tube Iwithdrawing from the filter chamber 8 and its tubular seat I8, and saidfilter chamber. remaining in the coffee receptacle 3.

In Figures 3 and 4 of the drawing my invention is illustrated asembodied in a coffee maker of the urn type which includes the primaryelements of the embodiment of my invention shown in Figures 1 and 2,such as the water supply receptacle I, boiling chamber 2, coffeereceptacle 3, check valve 4, filter 5, float valve 6, filter tube 1,opening 9 in the top of the coffee receptacle, lid II) for said openingand tubular seat I8 upon which the filter chamber 8 is detachablymounted. The water supply receptacle has a water inlet 3|, forintroducing water into the same, and a base 32 for supporting theapparatus on a stove with the boiling chamber 2 over the stove burner. Afaucet 33 is connected to the lower part of the coffee receptacle 3 fordrawing off the coffee from said receptacle. An auxiliary valve 34 maybe provided for closing the upper end of the filter supply tube 1 whenthe coffee is made in the coffee receptacle 3 and the float 26 hasuncovered the by-pass outlet 21, whereby steam from the boiling waterfrom the tube 1 to the filter chamber 8 is positively shut off. Saidauxiliary valve 34 may be formed on the upper end of an auxiliary tube35, upstanding from the float 26 around the tube 1 through an enlargedtubular seat I8 and the filter chamber 8, and provided with perforations36 near its upper end to permit the escape'of' boiling water from theupper end of the filter tube 1, when the float 26 is raised and coversthe by-pass outlet 21 for causing the boiling water to pass through saidtube to the filter chamber 8 for making coffee as aforesaid. The stop 28is formed on the tube 35 and engages the under side in the water supplyreceptacle I, when the float 26 is in position uncovering the by-passoutlet 21 and the water level in said receptacle corresponds to thelevel 30. v

In this specification and the annexed drawing I disclose my invention informs which I consider desirable, but I do not limit my invention tosuch forms, because it may be embodied in other forms, and it is to beunderstood that in and by the claims of this specification, I intend tocover my invention in whatever form it may be embodied.

I claim as my invention:-

1. In an apparatus as disclosed, a water-supply receptacle, a coffeereceptacle, a coffee filter chamber, a water-boiling chamber, a plugclosing the upper end of said water-boiling chamber provided with inletsfor admitting water from said water-supply receptacle into saidwater-boilingchamber, said plug being formed with a depending stud and abore extending through said stud, a collar valve slidably fitted on saidstud below said inlets for controlling the supply of water from saidwater-supply receptacle through said inlets, a nut on the lower end oisaid stud for retaining said valve on said stud, and a filter tubeconnected at its lower end to said plug in said bore and extendingupwardly into said coffee filter chamber.

2. Apparatus as disclosed in claim 1 including means for automaticallypreventing a further supply of boiling water from said water-boilingchamber through said filter tube into said filter nor w. om.

